# Relationship history for MSHA mine 3003871

Current hierarchy: **Dennis E  Condron → D Condron Construction Inc → B & C Sand and Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Dennis E  Condron → B & C Sand and Gravel; 2008-06-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D Condron Construction Inc → B & C Sand and Gravel; 2013-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis E  Condron → D Condron Construction Inc; 2013-03-26 to current/open; source msha-controller-operator-history